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United States Patent | 5,663,425 |
Detroit ,   et al. | September 2, 1997 |
A method is disclosed for production of acid soluble humates. Humic acid bearing ores are sulfoalkylated under alkaline conditions to produce high solids humic acid concentrates which are soluble at pH as low as 0.5 and in yields of at least 70 percent.
Inventors: | Detroit; William J. (Schofield, WI); Lebo, Jr.; Stuart E. (Schofield, WI); Bushar; Lori L. (Schofield, WI) |
Assignee: | LignoTech USA, Inc. (Rothschild, WI) |
Appl. No.: | 592270 |
Filed: | January 26, 1996 |
Current U.S. Class: | 562/32 |
Intern'l Class: | C07G 001/00 |
Field of Search: | 562/32 |
3700728 | Oct., 1972 | Moschopedis et al. | 562/32. |
4319041 | Mar., 1982 | Goff | 562/475. |
4842770 | Jun., 1989 | Patel | 252/8. |
4912256 | Mar., 1990 | Cronje | 562/465. |
5004831 | Apr., 1991 | Dekker et al. | 562/475. |
Yaghmaie et al, Coal-Water Slurries of Low Viscosity, Chemical Abstracts, vol. 102, 1985, p. 156. Zhambal, Composition and Structural Features of Sufohumic Acids, 51-Fossil Fuels, vol. 115, 1991, p. 139453. Sharanova, Determination of the Amount and Form of Sulfur in Sulfonated Humates, 51 Fossil Fuels, vol. 107, 1987, p. 99563. Olle Otero et al, Sulfited and Sulfonated Derivatives of Humic Acid and the Like,19-Fert. Soils, Plant Nutr., vol. 96, 1982, p. 84643. Pobedonostseva et al, Nonfuel Coal Processing, Chemical Abstracts, vol. 90, 1979, p. 106702. Humic Acids, The Merck Index, Eleventh Edition, 1989, p. 4675. |
TABLE 1 ______________________________________ EFFECT OF FORMALDEHYDE AND SODIUM meta-BISULFITE CHARGES ON YIELDS, SULFONIC SULFUR CONTENTS AND PRECIPITATION pH OF ACID SOLUBLE HUMIC ACIDS CH.sub.2 O Na.sub.2 S.sub.2 O.sub.5 Charge Sulfonic Sulfur Yield, Precipitation Charge (%) (%) (%) % pH ______________________________________ 0 0 0 76 4.5 6 15 2.9 76 1.5 9 20 3.4 78 1 12 28 4.5 78 0.5 16 33 5.3 80 <0.5 ______________________________________
TABLE 2 ______________________________________ EFFECT OF SULFOALKYLATION ON SOLUBILITY OF HUMIC ACIDS IN LOW pH FERTILIZERS % Insolubles % Sodium Sulfonic Fertilizer #1 Fertilizer 190 2 Bisulfite Sulfur, % 14.9-4.2-0-4 (pH 1.5) 3-30-0-4 (pH 0.5) ______________________________________ 0 0 15 20 15 2.9 10 12 20 3.4 8 10 28 4.5 6 8 33 5.3 1 1 ______________________________________ Note: % Insolubles determined by mixing 1 gram of humic acid in 50 grams of fertilizer solution and measuring % DeLaval sludge